Error on misatched file extensions

[eye-wave]

App doesn't handle it very well when images have wrong extensions, this can happen a lot when downloading images from the internet. i think image crate in rust can determine the right format based on actual bytes of the image?

[ggand0]

Thanks for reporting this. The app was already using the image crate's API to detect the format from file content for the most part, but there was a block that didn't do this (async image loading func called when you navigate images). Fixed this in a71aaf3 but let me know if the issue persists. If you have a specific scenario where the app fails I'll try to reproduce it.